Actually, I think it means you're being "held", which means they've reviewed your app and they can't reach a decision on it (neither accept, nor WL, nor ding) so they're going to come back to it later or something. Maybe they will be coming back to it before they review their waitlist? It's weird and I don't know much about it, but try to look around on this site for info on being "held" because you're definitely not the first person to have this question.